Gear shifting mechanism



Nov. 4, 1947. P. GRANT GEAR SHIFTING MECHANISM f Fiied Feb. 7, 194e 2 Sheets-Sheet 1 Invenl'or,

Nov. 4, 1947. P. GRANT' GEAR SHIFTING MEcHANIsM 2 Sheets-Sheet '2 Filed Feb. 7, 194e W 5 EL w Mm E Rr. vwf .H Eorvwm R/ WNH l lllllllllllln Invenor, Pbz'lze @reni n farney atenteci ov. 4,

UMTPED STATE-s- PATENT oFFicE 130,165 SE1-1eme iiiibb een, eve-iena, message jt 7 m 'ei '1%'. time object ofthe invention is' to provide-a gear shifting mechanism for lm tor vehicles whereinchanging from low 4l interm'edi'ate or vice 'versa-,- or from interm'ed to-hi" or vice versa; isere fected without-theol''rati'on f the' clutch. The clu'tch is used only `vvhe'rifsh'iftii'rg from loW to reverse or vi'ce versa,

In the drawings; wherein like numerals of rel`' erence indicatefcorrespondinfg parts -in the various figures; l Y

Figure -1 isa tdppln vie'vv j0fY the gear bdX aridi enclosed-gears; rieure 2 isa-merger--iess-diagrammatie 'View er Figure 1; Figures is as ection dniiri'e 3 3 in Figuren;

Figure 4' is" ai' 'fragmentary S'ide' eleVtion O'f Figure 3;

Figure 5f mre"- or less diagrammatic view of the shifting-leve-lockingmeans.

VReferringI now' to the dra-Wings, I' is a'fdriving shaft which is'fperfatively' connected' to and disconnected from the' motor shaft II by means'v of a conventional clutch I2. I isra-sleeveclutchmember I3, which is adapted to operativelyengage Jwith or disengage from the driven shaft 2IJi, vmore particularly to engage a clutchmember2i| ri-gid with theshaft 2U. When the clutch members I3 and ZIyarefengagedboth shafts 2D and I0 will rotate as a unit, and if the clutch is engaged', direct drive o'r` high speed will result.

The-`V sleeve, clutch memhe13- lf3 .is adapted;Y to engage and disengaged second Clutch member I4 loose on the shaft IU to rotate thereon but restrained from axial movement thereon as by a pin I rigid on the sleeve and riding in a transverse groove (not shown) formed into the shaft IU.

Rigid on the sleeve I4 are three gears I 6, I1 and I8, of diiferent effective diameters. Journalled in a member 22 is a shaft 23 on which three gears 24, 25 and 26 are splined. Also journalled in the member 22 is an idling gear 21 permanently in mesh with the gear 24. The gears 24, 25 aznd 26 are mounted so to be in xed relationship, while the shaft 23 is free to move axially in the gears. Gears 21, 25 and 26 are adapted to mesh with gears I6, I1 and I8, respectively. The member 22 is pivotally mounted as at 29 to a casing or housing 3i) enclosing the gears and shafts aforesaid and is supported at its free end by rollers 22A journalled on the member 22 and riding in the casing.

splin'ed toE the shaftl from" gears l1 and I"8",th driven shaft 2 5 will ro'- tate in a direction opposite to that of the driving snaft m; in other words, tn gear sniftingmecnanisin will be jinA reversej A The gears I8 and1 I "l, and' the gears 2 5 ja'nd 28are so formed and spaced, and' areof such effective diameters, that gears 25 and n,

and gears' 2 6 `and I8, will engage' successively for flow and intermediate speeds', by an antigclockwise-rotary displacement f theI member 22; Continuedsuch rotary displacement Willcuse dSelgag'meIltOf Agears -26 and' i8, arielI as Will be explained later, theclutchV member I3 will diseage the clutch member Illy to subb'y effectively couple the driven shaft 2B directly toftlie"drivingshaftt I0.

-II'I'Ordr tobodily move the-member 22 in pivots 29 toishift gears as arc f a" circle on vits desired;A that is,V to change speedthere is pro'- viliedv ai shifting lever `4l) suitably mounted'l for rocking' movement in twovplanes and for axial ement. Conveniently", the lever' may include a'ipin 4fI journalled -in a` slotted' roller bearing' journallledat oppositeends in a bearing 43 formingpart f a' bracket 44: secured to the casing.` The lever is slotted longitudinally as at 46 to slidablt7 receive the pin 4 I, The lower end of the lever is suitably connected to one end of a link 48 for relative movement in two places. Conveniently, the lower end of the lever may carry a ball (not shown) journalled in a spherical bearing 49 secured to the link 48. The other end of the link is pivotally connected as at 5B to the upper end of a lever 52 which is pivotally supported as at 53, at the lower end thereof to a bracket 55 secured to the casing. The bracket 55 is slotted as at 55A to permit of a certain longitudinal movement of the lever 52 relatively to the pivotal connection or pin 53. The lever is formed, intermediate of its length, with a fork 55 mounting oppositely-disposed pins 51 engaging in a transverse groove 58 formed in the periphery of the coupling member I3. The fork is slotted as at 59 to permit of a certain longitudinal movenient of the lever 52 relatively to the pins 5l. The fork 56 is positioned lengthwise of the lever 52 appreciably nearer to the pin 531 than to the pin 50, so that for a given arcuate movement of the upper end of the lever 52, the longitudinal movement of the fork, more particularly of the pins 53', will be greatly less.

The gears I8 and 2B are so formed and the coengaging effective portions of the coupling members I3 and 2l are such, that the coupling members I3 and 2l will effectively engage shortly after the gears I8 and 25 will eectively disengage, and

the coupling members I3 and I4 also disengage,

and vice versa, so that the device will be shifted or operated to change successively and eiectivelt7V from intermediate to high or direct'drive,`

and vice versa. Obviously, and ,it follows that,

of said last-named gears with one of said firstnamed gears, and an operative connection between said means and said coupling operating to operatively disconnect said driving and driven shafts when either of said last-named gears is in operative connection with one of said first-named gears.

3. In a gear shifting mechanism, the combination of a driving shaft, at least three gears rotatable with said shaft, a driven shaft, a movable coupling between said shafts operable to operatively connect and disconnect said shafts, a countershaft rotatable with said driven shaft, at least when the gears I1 and 25 are in mesh, for low n speed, the gears I8 and 26 will be disengaged and;

similarly the coupling members I3 and 2i will be disengaged or in inoperative relationship. Neutral position is reached when the coupling member I3 is disengaged both from the coupling membersIIlandZl.

In order to releasably lock the shifting lever 4l] inselected position, for reversa low, intermediate, high or neutral, any suitable device may be provided, which may take the form shown in Figure 5, comprising a rake-like bar 6G notched to receive the lever in the selected position and a spring 6I`opposite the notched bar to urge the lever in either of the selected positions.

I claim:

l. Ina-gear shifting mechanism, the combination of a driving shaft, at least two gears rotatable with said shaft, a driven shaft, a countershaft rotatable with said driven shaft, at least two gears rotatable with said countershaft, and means journalling said last-named gears adapted to `be bodilymoved in an arc of a circle successively to cause said last-named gears to operatively engage with said rst-named gears to vary the relative rotary speeds of said driving and driven shafts. y i

2. In a gear` shifting mechanism, the combination of a drivingv shaft, at least two gears rotatable with said shaft, a driven shaft, a movable coupling between said shafts to operatively connect and disconnect said shafts, a countershaft rotatable-with said driven shaft,\at least two gears rotatablewith said countershaft adapted to mesh with said first-named gears to provide a speed differential between driving and driven shafts, means journalling said last-named gears adapted to be moved in an arc of a circle to cause the operative engagement and disengagement of either three gears rotatable with said countershaft, a pivotally supported member journalling said lastnamed `gears and adapted to be moved to cause the operative engagement and disengagement of either of said last-named gears with one of said rstnamed gears to provide speed differentials between said driving and driven shafts, means formoving said member to gear interengagement to provide the selected speed differential, and an operative connection between said member and said coupling to cause the operative connection of said driving and driven shafts when all of said gears are in disengaged relationship.

4. `'In a gear shifting mechanism, the comblnationof a driving shaft, gears rotatable with said shaft, a driven shaft, a movable' coupling between said shafts tol operatively connect andv disconnect said shafts, a -countershaft rotatable with said driven shaft, gears rotatable with said countershaft, adapted to co-operate with said first-named gears for speed differentials between said driving and driven shafts, a member journalling said last-named gears and adapted to be moved in an arc of a circle to move said gears into operative and inoperative speed-differential relationship, an operative connection between said member and said coupling operable to operatively connect said driving and driven shafts when none of said-gears are in speed-differential engagement and to operatively disconnect such shafts when either of said gears are in speeddifferential relationship.

f PHILIPPE GRANT.

REFERENCES CITED Y The following references are of record in the `829,066 i Fox Aug.21, 1906 

